G1505 — heilikrineia
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
heilikrineia — pronounced i-lik-ree'-ni-ah
from 1506; clearness, i.e. (by implication) purity (figuratively):--sincerity. see GREEK for 1506
3 occurrences in the KJV.
1 Corinthians 5:8
Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth.
2 Corinthians 1:12
For our rejoicing is this, the testimony of our conscience, that in simplicity and godly sincerity, not with fleshly wisdom, but by the grace of God, we have had our conversation in the world, and more abundantly to you-ward.
2 Corinthians 2:17
For we are not as many, which corrupt the word of God: but as of sincerity, but as of God, in the sight of God speak we in Christ.